MulDiv

// KERNEL32.dll
#include <windows.h>

INT MulDiv(
    INT nNumber,
    INT nNumerator,
    INT nDenominator
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function MulDiv(
    nNumber As Integer,   ' INT
    nNumerator As Integer,   ' INT
    nDenominator As Integer   ' INT
) As Integer
End Function

' nNumber : INT
' nNumerator : INT
' nDenominator : INT
Declare PtrSafe Function MulDiv Lib "kernel32" ( _
    ByVal nNumber As Long, _
    ByVal nNumerator As Long, _
    ByVal nDenominator As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MulDiv = ctypes.windll.kernel32.MulDiv
MulDiv.restype = ctypes.c_int
MulDiv.argtypes = [
    ctypes.c_int,  # nNumber : INT
    ctypes.c_int,  # nNumerator : INT
    ctypes.c_int,  # nDenominator : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
MulDiv = Fiddle::Function.new(
  lib['MulDiv'],
  [
    Fiddle::TYPE_INT,  # nNumber : INT
    Fiddle::TYPE_INT,  # nNumerator : INT
    Fiddle::TYPE_INT,  # nDenominator : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn MulDiv(
        nNumber: i32,  // INT
        nNumerator: i32,  // INT
        nDenominator: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll")]
public static extern int MulDiv(int nNumber, int nNumerator, int nDenominator);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_MulDiv' -Namespace Win32 -PassThru
# $api::MulDiv(nNumber, nNumerator, nDenominator)

#uselib "KERNEL32.dll"
#func global MulDiv "MulDiv" sptr, sptr, sptr
; MulDiv nNumber, nNumerator, nDenominator   ; 戻り値は stat
; nNumber : INT -> "sptr"
; nNumerator : INT -> "sptr"
; nDenominator : INT -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "KERNEL32.dll"
#cfunc global MulDiv "MulDiv" int, int, int
; res = MulDiv(nNumber, nNumerator, nDenominator)
; nNumber : INT -> "int"
; nNumerator : INT -> "int"
; nDenominator : INT -> "int"

; INT MulDiv(INT nNumber, INT nNumerator, INT nDenominator)
#uselib "KERNEL32.dll"
#cfunc global MulDiv "MulDiv" int, int, int
; res = MulDiv(nNumber, nNumerator, nDenominator)
; nNumber : INT -> "int"
; nNumerator : INT -> "int"
; nDenominator : INT -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procMulDiv = kernel32.NewProc("MulDiv")
)

// nNumber (INT), nNumerator (INT), nDenominator (INT)
r1, _, err := procMulDiv.Call(
	uintptr(nNumber),
	uintptr(nNumerator),
	uintptr(nDenominator),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function MulDiv(
  nNumber: Integer;   // INT
  nNumerator: Integer;   // INT
  nDenominator: Integer   // INT
): Integer; stdcall;
  external 'KERNEL32.dll' name 'MulDiv';

result := DllCall("KERNEL32\MulDiv"
    , "Int", nNumber   ; INT
    , "Int", nNumerator   ; INT
    , "Int", nDenominator   ; INT
    , "Int")   ; return: INT

●MulDiv(nNumber, nNumerator, nDenominator) = DLL("KERNEL32.dll", "int MulDiv(int, int, int)")
# 呼び出し: MulDiv(nNumber, nNumerator, nDenominator)
# nNumber : INT -> "int"
# nNumerator : INT -> "int"
# nDenominator : INT -> "int"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。

const std = @import("std");

extern "kernel32" fn MulDiv(
    nNumber: i32, // INT
    nNumerator: i32, // INT
    nDenominator: i32 // INT
) callconv(std.os.windows.WINAPI) i32;

proc MulDiv(
    nNumber: int32,  # INT
    nNumerator: int32,  # INT
    nDenominator: int32  # INT
): int32 {.importc: "MulDiv", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
int MulDiv(
    int nNumber,   // INT
    int nNumerator,   // INT
    int nDenominator   // INT
);

ccall((:MulDiv, "KERNEL32.dll"), stdcall, Int32,
      (Int32, Int32, Int32),
      nNumber, nNumerator, nDenominator)
# nNumber : INT -> Int32
# nNumerator : INT -> Int32
# nDenominator : INT -> Int32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t MulDiv(
    int32_t nNumber,
    int32_t nNumerator,
    int32_t nDenominator);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.MulDiv(nNumber, nNumerator, nDenominator)
-- nNumber : INT
-- nNumerator : INT
-- nDenominator : INT
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('KERNEL32.dll');
const MulDiv = lib.func('__stdcall', 'MulDiv', 'int32_t', ['int32_t', 'int32_t', 'int32_t']);
// MulDiv(nNumber, nNumerator, nDenominator)
// nNumber : INT -> 'int32_t'
// nNumerator : INT -> 'int32_t'
// nDenominator : INT -> 'int32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("KERNEL32.dll", {
  MulDiv: { parameters: ["i32", "i32", "i32"], result: "i32" },
});
// lib.symbols.MulDiv(nNumber, nNumerator, nDenominator)
// nNumber : INT -> "i32"
// nNumerator : INT -> "i32"
// nDenominator : INT -> "i32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t MulDiv(
    int32_t nNumber,
    int32_t nNumerator,
    int32_t nDenominator);
C, "KERNEL32.dll");
// $ffi->MulDiv(nNumber, nNumerator, nDenominator);
// nNumber : INT
// nNumerator : INT
// nDenominator : INT
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Kernel32 extends StdCallLibrary {
    Kernel32 INSTANCE = Native.load("kernel32", Kernel32.class);
    int MulDiv(
        int nNumber,   // INT
        int nNumerator,   // INT
        int nDenominator   // INT
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun MulDiv = MulDiv(
    nNumber : Int32,   # INT
    nNumerator : Int32,   # INT
    nDenominator : Int32   # INT
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef MulDivNative = Int32 Function(Int32, Int32, Int32);
typedef MulDivDart = int Function(int, int, int);
final MulDiv = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<MulDivNative, MulDivDart>('MulDiv');
// nNumber : INT -> Int32
// nNumerator : INT -> Int32
// nDenominator : INT -> Int32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function MulDiv(
  nNumber: Integer;   // INT
  nNumerator: Integer;   // INT
  nDenominator: Integer   // INT
): Integer; stdcall;
  external 'KERNEL32.dll' name 'MulDiv';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "MulDiv"
  c_MulDiv :: Int32 -> Int32 -> Int32 -> IO Int32
-- nNumber : INT -> Int32
-- nNumerator : INT -> Int32
-- nDenominator : INT -> Int32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let muldiv =
  foreign "MulDiv"
    (int32_t @-> int32_t @-> int32_t @-> returning int32_t)
(* nNumber : INT -> int32_t *)
(* nNumerator : INT -> int32_t *)
(* nDenominator : INT -> int32_t *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library kernel32 (t "KERNEL32.dll"))
(cffi:use-foreign-library kernel32)

(cffi:defcfun ("MulDiv" mul-div :convention :stdcall) :int32
  (n-number :int32)   ; INT
  (n-numerator :int32)   ; INT
  (n-denominator :int32))   ; INT
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $MulDiv = Win32::API::More->new('KERNEL32',
    'int MulDiv(int nNumber, int nNumerator, int nDenominator)');
# my $ret = $MulDiv->Call($nNumber, $nNumerator, $nDenominator);
# nNumber : INT -> int
# nNumerator : INT -> int
# nDenominator : INT -> int
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。